PCB Integration

Sample content. Pinouts, voltages, and values below are placeholders. Always refer to the official datasheet for production designs.

This page describes how to integrate an EtherCAT hardware module onto your own carrier PCB.

Power

Rail	Voltage	Notes
VCC	3.3 V	Main module supply; add local decoupling.
VIO	1.8 / 3.3 V	Host interface I/O reference.
GND	0 V	Common ground plane.

Recommendations:

• Place a bulk capacitor (e.g. 10 µF) plus per-pin 100 nF decoupling close to the module's power pins.
• Use a solid ground plane under the module.

Host interface pinout (example)

Pin	Signal	Direction (module)	Description
1	VCC	--	3.3 V supply
2	GND	--	Ground
3	SPI_CLK	In	Host SPI clock
4	SPI_MOSI	In	Host to module data
5	SPI_MISO	Out	Module to host data
6	SPI_CS#	In	Chip select (active low)
7	IRQ#	Out	Interrupt to host
8	RESET#	In	Active-low reset

Ethernet ports

The module exposes two EtherCAT ports (IN and OUT) for daisy-chaining:

• Route each port's differential pairs (TX+/TX-, RX+/RX-) as 100 Ω differential with matched lengths.
• Keep the pairs short and away from noisy signals.
• Use magnetics-integrated connectors or discrete magnetics per the datasheet.

Upstream device  ===>  [ IN ]  Module  [ OUT ]  ===>  Downstream device

Layout checklist

• Decoupling capacitors placed close to module power pins.
• Solid, continuous ground plane beneath the module.
• Ethernet pairs routed as 100 Ω differential, length-matched.
• Host interface kept short; series termination if required.
• RESET# and IRQ# connected to the host MCU.
• EEPROM/ESI access verified during bring-up.

Bring-up

1. Power the carrier board and confirm the module's supply rails.
2. Verify the host interface link (SPI/parallel) with a register read.
3. Connect to an EtherCAT network and confirm the device is discovered by the master software.